ESP prick wire spark discharge voltage in the role: After the pole pitch to determine the output voltage and the yin and yang, the choice of cathode lines and yin and yang plate arrangement, to try to increase the discharge voltage anode and cathode distance (or hit breakdown voltage), reducing the sparking rate, improve collection efficiency, because stronger spark discharge, taking into account the safety of the power supply side and start thyristor rectifier transformer regulating plates occur between yin and yang, or even cut off SCR conduction, leading to the electrostatic field strength is reduced or even disappear. 20cm pole pitch in different conditions, laboratory measured tubular prick line breakdown voltage 129kV, spiral 112kV, fish bone acupuncture line 115kV, zigzag lines 128kV. Improving the breakdown voltage of the electric field, they should choose a higher breakdown voltage of jagged lines. Selection parameter is often contradictory, corona current strong cathode line often breakdown voltage is low, and therefore can not be considered unilateral, and to compare a comprehensive selection to choose from. In general, the electrostatic field must first meet the normal removal of the breakdown voltage between the anode and cathode of the requirements, followed by selection can produce a strong corona current cathode line.